Englishfor English speakers
strengthening
—
noun
becoming stronger
—
noun
the act of increasing the strength of something
of
Preposition
—
Made using.
It is a house of cards.
a
Determinative
—
A is used when the following word could be any of a certain type.
Compare "A book I saw on the shelf" and "The book I gave you yesterday".
a
Noun
—
A is the first letter of the alphabet.
The letter "a" comes before "b".
—
In some schools, an A is a very high grade.
Ron got an A on his earth science test.
theorem
—
noun
a proposition deducible from basic postulates
—
noun
an idea accepted as a demonstrable truth